U.S. President Donald Trump has warned NATO allies that failing to assist the United States in protecting shipping through the Strait of Hormuz would not be good for NATO’s future. In an interview with the Financial Times, Trump said that reopening the strait for countries benefiting from it would be the only right decision, noting that Europe and China are heavily dependent on oil from the Gulf.

Trump cautioned that if there is no response from other nations, it could be very bad for NATO’s future, emphasizing that the United States has treated its European allies very well. He added that the U.S. did not have to help Europe over Ukraine, as it is thousands of miles away, but did so nonetheless, and now expects reciprocal support.

The president called on China, France, Japan, South Korea, and the United Kingdom to help reopen the strait, which is considered the world’s busiest oil transit route, carrying about 20 percent of global oil supply.